22172399 has 2 divisors, whose sum is σ = 22172400. Its totient is φ = 22172398.

The previous prime is 22172351. The next prime is 22172413. The reversal of 22172399 is 99327122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22172399 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22172329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11086199 + 11086200.

It is an arithmetic number, because the mean of its divisors is an integer number (11086200).

Almost surely, 2^22172399 is an apocalyptic number.

22172399 is a deficient number, since it is larger than the sum of its proper divisors (1).

22172399 is an equidigital number, since it uses as much as digits as its factorization.

22172399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 22172399 is about 4708.7576917909. The cubic root of 22172399 is about 280.9339518785.

The spelling of 22172399 in words is "twenty-two million, one hundred seventy-two thousand, three hundred ninety-nine".